Correct Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Boundary Value Analysis (BVA) focuses on test cases at the edges of partitions because defects often occur at boundaries. The temperature ranges are:
7 (Too cold W)
[8-21] (Standstill X)
[22-29] (Ideal Y)
30 (Too hot Z)
A two-point BVA means testing both the lower and upper boundary values of each partition.
The correct selection {7,8,21,22,29,30} includes:
7 Boundary of Too Cold (W)
8 Lower boundary of Standstill (X)
21 Upper boundary of Standstill (X)
22 Lower boundary of Ideal (Y)
29 Upper boundary of Ideal (Y)
30 Lower boundary of Too Hot (Z)
This ensures maximum boundary coverage.